Honing element



June 26, 1956 J. B. KLEIN 2,751,726

HONING ELEMENT Filed Jan. 19, 1953 noNING ELEMENT James B. Klein, Rockford, 111., assignor to Barnes Drill Co., Rockford, 111., a corporation of Illinois Application January 19, 1953, Serial No. 332,014

13 Claims. (Cl. 51184.3)

This invention relates to abrading elements as used in honing tools and each comprising an elongated bar of bonded abrasive known as a stick together with the carrier through which the stick is supported laterally or backed in the tool body by material having a wear rate no less than that of the abrasive stick.

The general object is to provide a mounting for a honing stick which, as compared to prior mountings, is simpler in construction and enables a substantially larger part of the stick to be used before replacement is necessary.

Another object is to support the stick through the medium of layers of suitable material secured to opposite sides of the stick and providing a flange projecting beyond the bottom of the stick and adapted for detachable engagement with a supporting bar.

The invention also resides in the novel manner of mounting the supporting strips on the hone body.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawings, in which:

Figure 1 is a fragmentary longitudinal sectional view of a honing tool incorporating the improved honing element.

Fig. 2 is a cross section taken along the line 22 of Fig. 1.

Fig. 3 is an exploded perspective view of the honing element.

Fig. 4 is a fragmentary view of part of Fig. 1 showing a modification.

Fig. 5 is a fragmentary perspective view showing another modification.

Fig. 6 is a fragmentary longitudinal section incorporating the modification shown in Fig. 5.

Generally stated, the improved honing element comprises a rigid abrasive block such as a conventional abrasive stick 10 secured at its sides 11 to thin layers or strips 12 at least one of which projects well beyond the bottom of the stick to provide a flange 13 by which the element may be mounted in a novel manner in the body 1 of a honing tool. In the present instance, the abrasive block is an elongated bar of bonded abrasive and of uniform rectangular cross section throughout its length.

The strips 12 may vary widely in thickness and may, if desired, be as thin as of an inch. They are composed of a suitable material which will wear away progressively during the honing action along with the outer or working face 15 of the stick 10. A thermosetting phenolic type resin material such as Insurok T640 made by The Richardson Company has been found to be satisfactory.

In the form shown in Figs. 1 to 3, the strips 12 are of a length substantially equal to the stick 10 and of uniform width considerably greater than the depth of the stick. Each strip is secured to one side 11 of the stick preferably over the entire area of the side with one edge of the strip substantially flush with the working face 15 of the stick. This may be accomplished for example by asuitable film of adhesive such as ordinary Du Pont cement, the two parts being pressed together firmly during setting of the adhesive.

With the strips thus attached securely to the stick, one inner edge portion of each strip projects well below the bottom 16 of the stick and the spaced parallel flanges 13 thus formed cooperate with each other and the stick bottom to form a channel for receiving an elongated rigid bar 17 to which the honing element is fastened detachably for mounting in the tool body 14.

Since the bar is not a permanentpart of the expandable honing element, it is preferably made from solid stock of a cross section to fit closely in between the flanges 13 and seat against the bottom of the stick so as to form a rigid backing for the stick throughout the full length of the latter. The depth of the bar corresponds approximately to the Width of the flanges 13 and opposite end portions 18 of the bar project outwardly beyond the flange ends and are formed with notches 19 for receiving the usual garter bands or springs 20 by which the honing elements are contracted. In this instance, the ends of the notch walls project a short distance above the bottom 16 of the stick so as to provide shallow shoulders 21 which abut against opposite ends of the stick and positively hold the latter against longitudinal shifting relative to the bar. The notches 19 are of such depth that the outer surfaces of the springs 20 do not project appreciably above the bottom of the stick 10 thus providing for optimum wearing off of the latter before replacement becomes necessary.

Means is provided for detachably connecting at least one of the flanges 13 and the supporting bar 17 to permit ready replacement of the honing element after it has worn out in service use and to insure retraction of the element by the garter springs when the expanding cam is retracted. In the form shown in Figs. 1 to 3, this means comprises pins 22 disposed in recesses in the form of holes 23 and 24 which extend through the bar and the flanges and register with each other when the bar is seated against the bottom of the stick 10. With the bar thus locked or clamped to the flanges, the stick and the bar form a unitary assembly which may be mounted in the tool body in the usual way and in fact substituted for the honing elements heretofore used.

In the alternate form of connecting means shown in Figs. 5 and 6, lugs 25 are formed integral with opposite ends of the flanges 13 and project from the latter so as to underlie the garter springs 20 when the latter are seated in the notches 19. The springs thus bear against the lugs 25 as shown in Fig. 6 and thereby join the flanges 13 and the bar 17 together.

The honing element, when attached to the bar 17 as above described, is adapted to be received in radially opening guide slots 26 in the tool body 14 arranged to be shifted bodily by conventional conical cams 27 on an endwise movable expander rod 28. The parallel side walls of the slots 26 are spaced to receive the honing elements with a close but slidable fit with the bottom of the supporting bar 17 bearing against the outer straight edge of plates 29 having projections 39 which extend inwardly and bear against corresponding portions of the two cam surfaces 27. The slots 26 are spaced around the cylindrical part of the body 14 beyond which the ends 18 of the supporting bars 17 project (Fig. 1) to expose the notches 19 for the springs 20' by which the several honing elements are urged inwardly and held against the cam followers 29.

For certain applications, only the shoulders 21 are disposed beyond the ends of the stick 10, the notches 19 for receiving the springs 20 being cut in the bar ends as shown in Fig. 4 so as to underlie the ends of the stick.

3 This location of the notches is preferred in the honing of blind end holes.

To hold the honing elements against endwise shifting relative to the body during reciprocation of the latter with the sticks expanded against the work, oppositely facing transverse shoulders projecting laterally from the bar are adapted to abut against correspondingly spaced shoulders on the hone body 14. Herein, these shoulders are on a squared lug 32 formed on one side of each of the bar 17 and projecting outwardly through a complemental notch 33 in one of the flanges 13 and into a similar recess 34 in one side wall of the body slot. The recess also opens outwardly as shown in Fig. l to permit removal of the honing element assembly after release of the springs 20.

It will be apparent that the honing element comprising the stick and the strips 12 is of very simple construction capable of being produced at low cost and of remaining intact even though the stick may become cracked in service use. With one of the flanges 13 attached directly to the stick, a simple yet reliable means is provided for joining the stick to the supporting bar 17 and thereby holding the stick bottomed on the bar under the centrifugal forces encountered in service use. At the same time, the recess 24 in the flange and the fastening device 22 on the bar permits of ready removal and replacement of the honing element. Although the strips engage the work, they wear down with the abrasive sticks without in any way interfering with the honing action of the latter. With the improved mounting, it will be apparent that the sticks may be worn down to a much greater degree than has been possible heretofore before becoming weakened to the point of breakage. Thus, each stick remains attached to its supporting bar and is held firmly by the strips 12 as the stick wears away in service use.

I claim as my invention:

1. A honing element comprising a rigid stick of bonded abrasive of uniform rectangular cross section throughout its length, thin flat layers of material having a wear rate no less than that of the abrasive stick, said layers lying along opposite sides of the latter with one edge of at least one layer disposed substantially flush with the working face of said stick and the opposite edge portions of the layers projecting beyond the bottom of the stick to form laterally spaced and stifl parallel flanges cooperating with the stick bottom to define an open channel, a supporting bar received in said channel and lying against the bottom of said stick, the ends of said bar projecting beyond the ends of said stick and having grooves therein for receiving garter bands and a device extending through matching apertures in said bar and one of said flanges to connect the same detachably together.

2. A honing element comprising a rigid stick of bonded abrasive of uniform rectangular cross section throughout its length, thin flat layers of material having a wear rate no less than that of the abrasive stick and lying along opposite sides of the latter with one edge of at least one layer disposed substantially flush with the working face of said stick and the opposite edge portions of the layers projecting beyond the bottom of the stick to form laterally spaced parallel flanges cooperating with the stick bottom to define an open channel, a supporting bar received in said channel and lying against the bottom of said stick, the ends of said bar projecting beyond the ends of said stick, and lugs integral with opposite ends of each of said flanges and lying alongside said projecting bar ends and adapted for engagement with garter bands bearing inwardly against the edges of said lugs.

3. A honing element comprising a rigid stick of bonded abrasive of uniform rectangular cross section throughout its length, thin flat layers. of material having a wear rate no less than that of the abrasive stick and lying along opposite sides of the latter with one edge of at least one layer disposed substantially flush with the working face of said stick and the opposite edge portions of the layers projecting beyond the bottom of the stick to form laterally spaced parallel flanges cooperating with the stick bottom to define a channel, a supporting bar received in said channel and lying against the bottom of said stick, the free edge portion of at least one of said flanges having an outwardly opening notch therein intermediate the ends thereof, and a member on said bar projecting outwardly into said notch and operating to hold said one flange against movement longitudinally of the bar.

4. A honing element comprising a rigid stick of bonded abrasive of uniform rectangular cross section throughout its length, thin flat strips of nonmetallic material lying along opposite sides of the latter with one edge of at least one of the strips disposed substantially flush with the working face of said stick and the opposite edge portions of the strips projecting beyond the bottom of the stick along the full length of the latter to form parallel flanges cooperating with the stick bottom to define a channel for receiving a bar for supporting the element, adhesive films bonding said strips to the sides of said stick over substantially the entire areas thereof, and an aperture formed in at least one of said flanges for cooperation with a device on said supporting bar to join the element and the bar into a unitary assembly.

5. A honing element as defined in claim 4 in which said nonmetallic strips are wider than the depth of said stick with one edge thereof disposed substantially flush with the working face of the stick.

6. A honing element comprising a rigid stick of bonded abrasive of uniform rectangular cross section throughout its length, thin fiat layers of material having a wear rate no less than that of the abrasive stick, said layers being secured to the stick and lying along opposite sides of the latter with edge portions of the layers projecting beyond the bottom of the stick to form laterally spaced parallel flanges cooperating with the stick bottom to define a channel, a rigid bar disposed within and bearing against said flanges and the bottom of said stick, said bar having ends projecting outwardly and exposed beyond the opposite ends of said flanges, and means formedon at least one of said flanges and interengageable with means on said bar to hold the bar and flanges in seated relation.

7. A honing element comprising a rigid stick of bonded abrasive of uniform rectangular cross section throughout its length, thin and relatively rigid flat layers of nonmetallic material secured to the stick and lying along opposite sides of the latter with one edge portion of the layers projecting beyond the bottom of the stick to form stiif laterally spaced parallel flanges cooperating with the stick bottom to define a channel for receiving a bar for supporting the element, at least one of said layers being secured to said stick, and means formed on the secured flange for joining the same detachably to the supporting bar.

8. A hone comprising a rotary body having a longitudinally extending and outwardly opening slot therein and oppositely facing transverse shoulders spaced along the slot, a rigid stick of bonded abrasive of rectangular cross section throughout its length, thin flat layers of material having a wear rate no less than that of the abrasive stick, said layers being adhcsively secured to the walls thereof and lying along opposite sides of said stick with the top of the latter exposed and with the other edge portions of the layers projecting along the bottom of said stick to form laterally spaced parallel flanges cooperating with the stick to define an'o'pen channel, a rigid bar longer than said stick 'and seated in said channel with its ends projecting beyond said flange ends and having shoulders thereon abutting against opposite ends of said stick to lock the bar and stick against relative endwise displacement, means detachably joining said bar and at least one of said flanges to form a unitary honing element seated in said slot, and means rigid with and projecting laterally from said bar beyond one of said flanges and having oppositely facing shoulders abutting said body shoulders.

9. A hone comprising a rotary body having a longitudinally extending and outwardly opening slot therein and oppositely facing transverse shoulders spaced along the slot, a rigid stick of bonded abrasive of rectangular cross section throughout its length, thin flat layers of material adhesively secured to the Walls of said stick and having a Wear rate no less than that of the stick, said layers lying along opposite sides of said stick with the top of the latter exposed and with the other edge portions of the layers projecting along the bottom of said stick to form laterally spaced parallel flanges cooperating with the stick to define an open channel, a rigid bar longer than said stick and seated in said channel with its ends projecting beyond said flange ends and having shoulders thereon abutting against opposite ends of said stick to lock the bar and stick against relative endwise displacement, and means rigid with and projecting laterally from said bar beyond one of said flanges and having oppositely facing shoulders abutting said body shoulders.

10. For use with an elongated supporting bar having shallow shoulders spaced along and projecting from one edge thereof and a fastening device projecting from one side of the bar, a honing element comprising a rigid block including a stick of bonded abrasive and having a length to fit between said shoulders for abutment therewith, thin flat layers of material having a wear rate no less than that of said stick and rigidly attached to the block and extending along opposite sides thereof with one layer covering one side of said stick and extending substantially to the exposed working face thereof, at least one of said layers being relatively rigid and projecting beyond the bottom of said block to form a flange coacting with said bottom to form a recess and adapted to lie along said supporting bar when the latter is seated in the recess against the bottom of the block, and a recess formed in said flange in a position to receive said fastening device for holding said block bottomed against the bar.

11. For use with an elongated supporting bar having a fastening device projecting from one side of the bar, a honing element comprising a rigid block including a stick of bonded abrasive and having thin flat layers of nonmetallic material extending along opposite sides of said block and adhesively secured to the block with the top of the stick exposed, at least one of said layers being relatively rigid and projecting beyond the bottom of said block to form a flange defining one side of a recess for said supporting bar and adapted to lie along the bar when the latter is seated against the bottom of the block, and a recess formed in said flange in a position to receive said fastening device for holding said block bottomed against the bar.

12. A honing element comprising a rigid stick of bonded abrasive of uniform rectangular cross section throughout its length, thin and relatively rigid flat layers of material having a Wear rate no less than that of said stick and lying along opposite sides of the stick and adhesively secured thereto, at least one of said layers projecting beyond the bottom of the stick to form a stiff flange cooperating with the stick bottom to define a recess for receiving a bar for supporting the element, and means formed on said projecting flange for connecting the same detachably to the supporting bar to hold the bar against said stick bottom.

13. For use with an elongated supporting bar having a fastening device projecting from one side of the bar, a honing element comprising a rigid block including a stick of bonded abrasive and having thin and relatively rigid flat layers of material having a wear rate no less than that of said stick and lying along sides of said block and adhesively secured thereto with the top of the stick exposed, at least one of said layers projecting beyond the bottom of said block to form a flange defining one side of a recess for said supporting bar and lying along the bar when the latter is seated against the bottom of the block, and lugs integral with opposite ends of said flange and projecting beyond the ends of said stick for engagement with garter springs for holding the element seated on the bar.

References Cited in the file of this patent UNITED STATES PATENTS 2,106,205 Connor Jan. 25, 1938 2,265,377 Kline Dec. 9, 1941 2,467,094 Peden Apr. 12, 1949 2,675,654 Harris Apr. 20, 1954 FOREIGN PATENTS 683,014 France Feb. 24, 1930 

